What is the form of a language spoken in local area known as?

The form of a language spoken in a local area is known as a dialect.

Here's a breakdown:

* Dialect: A regional or social variety of a language distinguished by pronunciation, grammar, and/or vocabulary.

* Language: A system of communication using words and grammar.

For example, "American English" is a dialect of the English language, and "Southern American English" is a dialect of American English.